-76-
Model G0776 (Mfd. Since 7/14)
Symptom Possible Cause Possible Solution
Cutting tool
or machine
components vibrate
excessively during
cutting.
1. Tool holder is not tight enough.
2. Cutting tool sticks too far out of tool holder;
lack of support.
3. Gibs are out of adjustment.
4. Cutting tool is dull.
5. Spindle speed or feed rate is wrong.
6. Workpiece is deflecting.
7. Workpiece is unbalanced.
1. Tighten tool holder.
2. Re-install cutting tool so no more than
1
⁄3 of total
length is sticking out of tool holder.
3. Adjust gibs (see Page 78).
4. Replace or resharpen cutting tool.
5. Use recommended spindle speed (see Page 48)
and feed rate (see Page 51).
6. Change chucking length or diameter. Use support on
tailstock end.
7. Balance workpiece.
Workpiece is
tapered.
1. Spindle and tailstock are not properly
aligned with each other.
2. Lathe bed is twisted.
1. Re-align the tailstock to the headstock spindle
centerline (see Page 39).
2. Level lathe (see Page 23).
Chuck jaws will
not move or do not
move easily.
1. Chips are lodged in jaws or scroll plate.
2. Dent/ridge is in jaw slot of chuck body.
1. Remove jaws, clean and lubricate scroll plate, then
replace jaws.
2. Stone or file off high spot in jaw slots.
Spindle lacks
turning power or
starts up slowly.
1. Belts are slipping. 1. Tighten/adjust belts (see Page 83).
Gear change dials
will not shift into
position.
1. Gears not aligned inside headstock/quick-
change gearbox.
1. Rotate spindle by hand with light pressure on the
dial until gear falls into place.
Workpiece slips in
chuck.
1. Chuck jaws do not match workpiece
diameter.
2. Cutting force is too high.
3. Speed is too high.
4. Jaws are worn.
1. Reposition or mold workpiece so that diameter
matches chuck jaw dimensions.
2. Reduce cutting force.
3. Reduce spindle speed (see Page 48).
4. Replace jaws or chuck.
Carriage will not
feed or is hard to
move.
1. Gears are not all engaged.
2. Half nut lever is engaged.
3. Screw is loose on feed handle.
4. Carriage lock is tightened down.
5. Chips have loaded up on ways.
6. Ways are dry and in need of lubrication.
7. Gibs are too tight.
8. Gears or shear pin is broken.
9. Feed clutch is slipping.
1. Engage gears using gear dials.
2. Disengage half nut lever.
3. Tighten.
4. Check to make sure carriage lock is fully released.
5. Frequently clean away chips that load up during
turning operations.
6. Lubricate bedways/ball oilers.
7. Loosen gib screw(s) slightly (see Page 78).
8. Replace gears or shear pin (see Page 80).
9. Increase clutch spring pressure (see Page 82).
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